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Patent:US1286112
| Patent: | US 1286112 |
| Title: | Calculating Device |
| Date: | 26.11.1918 |
| Place: | |
| Country: | USA |
| Person: | Robertson, William Henry (P) |
| Company: | |
| Internal Links: | Consul |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1286112 (espacenet), US1286112 (uspto) |
Aus der Patentschrift US1286112
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